Filing resident taxes in both US and Canada (1040 + T1)

[willowhp]

I will be filing taxes in Canada for the first time. I have H1b in US and PR in Canada and maintain permanent homes in both US and Canada. I am a tax resident of both countries for 2024, but all my income is US sourced (W2, rental income, stock). All US sourced income was earned on US soil.

I was thinking of doing the following -

1. File 1040 in US (as a resident), married filing jointly, claim child tax credit - apply for transcript
2. File T1 in Canada separately for me and spouse - claim FTC for taxes already paid in US, pay difference in taxes to CRA - send via mail including IRS and state transcripts

My question is - if I have filed resident tax in US, can I still claim FTC on the taxes paid in Canada? OR does the treaty force dual residents to choose to be a tax resident of just one country? I have noticed many in this forum have used 1040NR and filed in US as non-residents, hoping to hear from someone who has filed resident taxes in both places without issues - please share your experiences?